Gas-lamp.



F. J. & H. R. HUMPHREY.

GAS LAMP.

APPLICATION FILED SEPT. 11, 1911,

1,051,593, Patented Jan.28, 1913.

4 SHEBTS-SHBET 1.

F. J. & H. HUMPHREY. GAS LAMP.

APPLIOATION FILED SBPTJI, 1911.

1,051,593. Patented Jan.28, 1913.

X7 4 SHEETS-SHEET z.

P. J. & H. R. HUMPHREY.

GAS LAMP.

APPLICATION FILED SEPT.11, 1911.

1,05 1,593. Patented Jan. 28, 1913.

4 SHEETS-SHEET 3.

F. J. & H. R. HUMPHREY,

GAS LAMP.

APPLICATION FILED SBPT.11,1911. 1,051,593. Patented Jan.28,1913.

6 8/ 4 SHEETS-SHEET 4.

amuemtom M 2 WW 4& $J%% M w aw w UNITE STATES PATENT @FFIQE.

FREDERICK J". HUMPI-IREY AND HUBER/I R. HUMPHREY, OF KALAMAZOO,MICHIGAN.

GAS-LAMP.

Specification of Letters Patent.

Patented Jan. 28, 1913.

Application filed September 11, 1911. Serial No. 648,704.

To all whom it may concern:

Be it known that we, FREDERICK J. I'IUM- IHREY and HUBERT It. HUMPHREY,citizens of the United States, residing at the city of Kalamazoo, countyof Kalamazoo, State of Michigan, have invented certain new and usefulImprovements in Gas-Lamps, of which the following is a specification.

This invention relates to improvements in gas lamps.

The main objects of this invention are: First, to provide an improvedgas lamp of the inverted burner type which is adapted for use on gas ofdifferent or varying pressures and of different or varying qualities orgrades. Second, to provide an improved gas lamp of the inverted burnertype in which the burners are so formed and arranged as to be readilyaccessible for cleaning or adjustment without disassembling the lamp.Third, to provide an improved gas lamp of the inverted burner type inwhich the gas is delivered so as not to become unduly heated beforereaching the burners, and one in which the burners are guarded. fromexcessive heatin Fourth, to provide an improved arrangement of pilot andconnections therefor. Fifth, to provide an improved gas lamp of theinverted burner type in which the parts are quite simple in form and areeasily assembled or disassembled. Sixth, to provide a lamp of this typehaving large candle power which is compact and attractive in appearance.7

Further objects, and objects relating to structural details willdefinitely appear from the detailed description to follow.

IVe accomplish the objects of our invention by the devices and meansdescribed in the following specification.

The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of our invention is clearlyillustrated in the accompanying drawing, forming a part of thisspecification, in which:

Figure I is a side elevation of a structure embodying the features ofour invention, the valve actuating chain and the gas supply pipe beingbroken away. Fig. II is a detail elevation view with the casing mantlesupport and globe removed, the globe supporting ring being shown open.Fig. III is a plan View of the parts shown in Fig. II, the supply pipebeing sectioned on line 3-3 of Fig. II, the globe supporting ring beingclosed. Fig. IV is an enlarged detail view, mainly in vertical section,on a linc,corre spending to line -Llt of Fig. III. Fig. V is ahorizontal section through the burner, taken on a line corresponding toline 5-5 of Fig. IV. Fig. VI is an inverted View of the tip i'nomber 2of the burner. Fig. VII is a detail vertical section taken on a linecorre sponding to line 7- 7 of Fig. II, showing the arrangement of thepilot burner and tube being shown in full lines. Fig. VIII is anenlarged detail section taken on a line corresponding to line S 8 ofFig. VII, the pilot [lashing valve and the passage regulating valvesbeing shown in full lines. Fig. IX is an enlarged detail perspectiveshowing the globe supporting hinge and its connection to the chimney.Fig. X is a detail perspective view of the globe holding catch. Fig. XIis a detail vertical section, showing structural details of the chimney.

In the drawing, similar reference characters refer to similar partsthroughout the several views, and the sectional views are taken lookingin the direction of the little arrows at the ends of the section lines.

Referring to the drawing, 1 represents a gas supply pipe by which thelamp is supported. The burner comprises a burner tip member 2, and aburner passage member 3. The burner tip member .2 is provided withburner arms l, having passages 5 therein communicating with the centraldistributing chamber (5. The structure illustrated has three burnertips.

The inlet or passage member 3 has a horizontally-disposed mixing tube orinlet passage arm 7 and a (lownwardly-projecting central delivery nipple8. This nipple is adapted to project into the chamber 6 of the burnertip member 2, and is provided with a flange E) to which the tip member 2is secured by means of the screws 10. The mixing tube 11 is preferablyremovable from the inlet passage member ;l, and projects into the samebeyond the delivery nipple thereof. (see Fig. IV).

A regulating valve 19. is threaded into the burner member 3 to coactwith the inner end of the mixing tube. The chamber in the inner end ofthe member 3 is considerably larger than the external diameter of theinner end of the mixing tube, so that there is an annular passage aboutthe inner end of the mixing tube. The inner end of this passage memberhas a spherical chamber into which the inlet tube delivers.

The valve 12 is provided with a conical end disposed centrally of thetube, so that the gas issuing from the mixing tube is more or lessuniformly deflected into the spherically walled chamber and passes backaround the mixing tube to the discharge 8 into the discharge chamber (3of the burner tip member 2.

The burner passage member 3 is arranged between the discharge flues 13of the chimney and in close proximity to the deflector plate 14 at thelower ends of the fines, the inlet arm being horizontally disposed, asstated. The burner tip member 2 is arranged below the deflector plate 14within the skirt portion 15 of the chimney. The discharge nipple of themember 3 projects through an opening provided in the plate into themember 2. see Fig. IV. Screws 1O secure the member 2 to the member 3,the screws being passed through the plate 14. A gasket 16 is arrangedbetween the plate and the flange 9 on the member 3.

To reduce the bulk of the burner member 2. ears 17 are provided for thescrews 10, the ears being arranged between the arms of the burner, seeFig. VI. plate 14 is extendedbeyond the skirt 15 to provide a flange 18on. which the chimney casing 19 rests. The flange 18 is provided withair inlets 20, see Fig. III, through which the secondary air passes tothe burners. We use the term secondary here in the sense in which it isquite commonly used in gas lighting terminology, to designate the airwhich is delivered to the burners at the point of combustion from theoutside of the burner as distinguished from the air admixed with the gasin the burner or its mixing tube.

The casing 19 is provided with air inlets 21 at its lower end throughwhich air enters the casing to the inlet 18 and thence into the globe 23to the burners and also to circulate about the fines 13 and out of thecasing, which is open at its upper end, the gases from the flues 13 andthe air circulated up through the casing and about the lines beingdischarged freely, the casing above its air inlet 2]. being unobstructedexcept by the burner and chimney parts inclosed thereby.

A top or ceiling deflector plate 22 is mounted on the supply pipe abovethe easing, and in a spaced relation thereto. The

' burners are inclosed by the globe 23, which is mounted on the globering 24, the globe being secured within the ring by screws 25, as iscommon practice. The globe support ing ring 24 is provided with a hingemember 26, provided with a pair of ears 27. The coacting hinge member 28is in the form of an angled strap which rests upon and is se- Thechimney cured to the chimney flange 18 by the screws 29, its innerupturned end 30 being secured to one of the chimney flues by the screwbolt 31.

The outer end of the strap is provided with a knuckle 32, which isembraced by the cars 27 of the hinge member 26. Thepintle 33 is lockedinv place by means of the spring catch or retainer 34. The catch 34 isformed of wire bent into a loop, the end of the loop being engaged overthe screw 35, one arm 36 of the loop being provided with an inturned end37 arranged through the ears 27, the other being free to engage a headwith which the pintle is provided. A hook or catch 38 is mounted on theinturned end 37 of the arm 36.

The hinge member 28 is provided with a keeper 39 for the book 38, thekeeper being formed by striking up a portion of the hinge member, asshown, (see Fig. IX). The globe ring 24 is retained in its closed position by a catch consisting of an angled strap like keeper member 40,which rests upon and is secured to the flange 18 by means of the screw41, its unturned inner end being secured to the other chimney fine bymeans of the screw 42. This keeper is provided with a key-hole slot 43in its downwardly-projecting outer end, adapted to receive the springpin catch 44 on the globe supporting ring. The details of this catch 44are not here illustrated, as they form no part of our present invention.

The globe supporting ring hinge member 28 and keeper 40 for the catch,thus arranged serve to brace the chimney flues and flange.

The deflector plate 14 is provided with an annular shoulder 45, uponwhich the skirt portion 15 is sleeved and secured. The chimney fiues 13are segmental in cross sections and their outer curved or semi-circularwalls fit within this shoulder. To form the flue openings in the platesegmental parts 45 are struck up therefrom. These parts are turned up atright angles to the plate and are secured to the inner walls of thelines, so that the fines are embraced by the shoulders and these parts45, see Figs. IV and XI. it-h the parts thus assembled, they aresecurely supported, and being made of sheet metal, are readily formedand assembled, and when thus assembled, can be subjected to theenameling process without serious distortion.

The burner chamber 6 has an opening at the bottom between the burnertips, and is closed by the removable closure plate 46. This plate isretained by means of lugs 47, provided on the inner sides of the burnerarms 4, see Figs. IV and VI. The burner chamber 6 is cylindrical inhorizontal section. The cylindrical screen 48 is removable through thisopening in the bottom of the burner between the arms withoutdisassembling the burner.

The screen, in the structure illustrated, is .mounted on the closureplate 4L6, a cup-like screen holder a9 being arranged on the plate andsecured thereto by means of the screws 50 which engage the disk 51.,clamping the inturned edges 52 at the bottom of the screen. These screws50 also secure the finger piece to the plate.

The edges of the closure plate 416 are spirally deflected between thenotches 51-, to provide spiral or cam portions 55, so that by a turningmovement of the plate, the spiral or cam portions are engaged with thelugs and the plate thus clamped in position.

With the parts thus arranged, the burner screen serves for all of theburners, and is easily removed for the purpose of cleaning or renewalshould occasion require. The bottom of the delivery chamber 6 and burnermember 2 is below the lower edges of the tip passage arm openings 5, sothat a trap is provided for solid substances which may pass into theburner, and this can be very quickly removed without disassembling theburner, as stated. Further, this trap collects condensation when theburner is not in use, which quickly evaporated upon the lighting of theburner.

The chimney is mounted and carried by the burner. The burner is, inturn, supported by the gas supply pipe '1. The burner member 3 isprovided with an upwardly-projecting coupling member 56, having alaterally-projecting delivery arm 57 which projects from the chimneythies 13, see Figs. III and IV. This coupling is pret erably formedintegrally with the burner member 3.

At its outer end, the arm 57 is provided with a seat 58 for the couplingarm or nipple 59 of the valve casing 60. This valve easing is arrangedon the outside of the chimney casing 19, the casing being provided withan opening 20 alined with the coupling arm 57 to receive the coupling59. The valve casing 60 is secured to the arm 57 by means of the screw61, threaded. longit-udinally into the arm and having a gas passage 62therein provided with lateral delivery openings 63.

The valve 64:, which is of the rotary type, is disposed transversely ofthe arm 57. This valve is disposed between the nipple 59 and thedelivery nozzle. The delivery nozzle is in the form of a tubular member65 threaded into the valve casing in alinement with the mixing tube'll.The valve 66 is threaded longitudinally through the member 65.

The valve casing 60 is provided with a nipple 67 adapted to receive theend of the mixing tube. The mixing tube is shouldered at 68 to engagethe end of the arm 7 of the burner member 3,and is clamped against thisshoulder by the valve casing when the parts are assembled. The mixingtube 11 is removable through an opening 69 in the chimney casing whenthe valve casing is removed, which may be done merely by disengaging thescrew (51.

V The air inlet opening 70 of the mixing tube are within the chin'inevcasing, and in the path'o'l the secondary air supply, which passes intothe casing through the air in lets .21 and to the burners through theair inlet. openings 20 in the flange 18, as described. This air is alsofree to circulate from the openings 21. about the chimney fines and outthrough the top of the casing, as stated.

The pilot burner Tl is arranged within the shirt portion 1.5 of thechimney, it being supported on the bottom section 72 of the gas deliverytube. This section is arranged through the skirt and threaded into thetube '3 which is, in turn,

section 1 threaded into a boss 74L provided "for the purpose on the arm57 ot' the coupling. A passage 75 is formed in the arm 57, the valvecasing being providciil with a registering passage 76 which is connectedby the passages 77 and T8 with the gas passage of the valve casing. Thepassage 78 opens into the passage 77, and is regulated by the threadedvalve 79 to control the constant supply of gas to the pilot see Figs.VII: and VIII.

The flashing valve 80 is provided with a longitudinal passage '81.communieating with the valve chamber and having a port 82 which opensinto the passage 77 when the valve 80 is actuated to admit a flashingsupply of gas to the pilot. A valve .l-t is provided for regulating theflashing supply; that is, the maximum delivery oil gas. The valve 80 isarranged in the valve casing 60 above the valve til, preferably in aboss-like extension on the side of the upper nipple portion 59 thereof.The valve 64- is provided with an actuating lever 83, which is mountedupon the stem thereof.

Secured to the lever 83 is a dislvlilte ratchet member 84:, while thevalve stem 95 is provided with a coacting ratchet member 85. The lever,with its ratchet member, is held yieldingly in engagement with theratchet member of the stem by the spring 86, which is coiled about thestem to press against the lever. The spring 86 is pro vided with arms atits end, the arm 87 at the outer end of the spring being engaged with apin 88 on the lever. The arm 89 at the inner end of the spring isengaged with a pin 90 projecting from the valve casing. This pin 90forms a stop for the lever.

The pilot valve 80 is provided with an arm 91, and is connected by thelink 92 to the pin 88 on the valve lever, so that the pilot flashingvalve is actuated whenever the main burner valve is actuated, either toclose or open the same. The valves are connected so that the flashing ofthe pilot valve is positive and remains flashed, or with the extrasupply of gas delivered to the pilot as long as the lever 83 is helddown. Then the lever is released, it is returned against the stop 90 bymeans of the spring.

An index arm 93 is provided for the valve stem to indicate to theoperator whether the valve is open or not. The pilot being flashed oneach actuation of the valve,that is, on both its opening and its closingactuations, is quite certain to be lighted when the burners are cut off.Sometimes the pilot is'extinguished on account of explosions takingplace when the burners are lighted, but it being flashed on theactuation of the valve to cut out the burners, it will be relightedbefore the burners are extinguished.

The mantle support 96 for the mantles 97, which are shown inconventional form in Fig. I, is preferably that shown in patent toHumphrey at all, No. 933,177, of September 7, 1909, and we do nottherefore illustrate or describe the same with further de tail herein. lVhen it is desired to remove the burner screen, the mantle supportingplate is dropped down and swung to one side, when the closure plate forthe burner chamber can be removed without disassembling the lamp ordisturbing the burner tips.

By the arrangement of the parts as we have illustrated and described, weproduce a lamp which is adapted for use in different or varying gradesor qualities of gas,that is, rich or lean gas and under different orvarying pressures. It has been found in practice that many gas lamps ofthe inverted burner type, which would operate with one quality orpressure of gas satisfac torily, are not adapted for gas of anotherquality or other pressure. Our improved lamp, as stat-ed, operatessatisfactorily under varying conditions without readjustment. Further,it is not likely to back fire on the lighting of the burners, or toexplode on cutting them off.

Claims are not made in this application to certain features of thestructure here illustrated, as applicants have made claims thereto incopending applications, Ser. No. (308,695, and Ser. No. 608,691, filedFebruary 15, 1911, the present structure being an em bodiment of certainof the features there disclosed, and further, certain claims are madeherein originally made in those applications, the structure illustratedbeing in some respects an improvement upon and a refinement of certainfeatures. of the said applications the structure here illustrated beingan embodiment of such inventions as now manufactured for the market.

Having thus described our invention, what We claim as new and desire tosecure by Letters Patent is:

1. In a gas lamp, the combination with the gas supply pipe, of a chimneycomprising a discharge flue, a deflector plate at the lower end of theflue and a skirt below said plate, the plate being extended beyond theskirt and having air inlet openings therein on the outside of the skirt;a casing open at the top arranged above said plate to inclose the saidair inlet openings thereof and having air inlet openings at its lowerend adjacent to said plate, said casing being open for the passage ofair from its said air inlet openings upwardly therethrough and aboutsaid flue to its open upper end; a burner comprising a burner tip memberarranged below said plate within said skirt and a mixing tube arrangedin a horizontal position above said plate and in close proximity theretoand having air inlet openings within said casing adjacent to the airinlet openings thereof and adjacent to the air inlet openings of saidplate; and a globe mounted to inclose the air inlet openings of saidplate whereby the secondary air supply to the burner is drawn from thecasing air inlets through the air inlets of said plate and air,circulates from said casing inlets upwardly through said casing and isdischarged with the products of combustion from said flue.

2. In a gas lamp, the combination with the gas supply pipe, of a chimneycomprising a discharge flue,a deflector plate at the lower end of theflue; a chimney casing open at the top and having air inlet openings atits lower end, said casing being open for the free passage of air fromits said air inlet openings upwardly therethrough and about said flue toits open upper end; a burner comprising a burner tip member arrangedbelow said plate and a mixing tube arranged in a horizontal positionabove said plate and in close proximity thereto and having air inletopenings within said casing adjacent to the air inlet openings there of,and a globe surrounding said burner and associated with said casing sothat the secondary air supply to the burner is drawn from the casing airinlets and free circulation of air from said casing inlets to the inletof the mixing tube and downwardly to the burner and upwardly through theeasing is permitted. I

In a gas lamp, the combination with the gas supply pipe, of a chimneycomprislng a discharge flue, a deflectorjplate at the lower end of saidflue and a skirt below the plate, theplate being provided with a centralburner opening; a burner comprising a mixing tubje member disposed abovesaid plate and provided with a delivery nipple registering with theburner opening of said plate, and a burner tip member disposed belowsaid plate within the said chimney skirt and provided with a centraldelivery and screen chamber communicating with the delivery nipple ofsaid mixing tube member and having a plurality of tip arms grouped aboutthe said delivery chamber, said delivery chamber being open at thebottom between said. arms; a screen arranged in said chamber andremovable therefrom through the opening in the bottom thereof; and aclosure plate for said chamber removable from the bottom of the chimneyskirt with out disassembling the burner otherwise than the removal ofsaid closure.

4.. In a gas lamp, a chimney comprising a discharge flue, adeflectorplate at the lower end of said flue having a burner openingtherein; a burner comprising a mixing tube member arranged above saidplate and provided with a downwardly projecting nipple arranged in saidopening and with ears above said plate; a burner tip member arrangedbelow said plate and having a central chamber adapted to receive saidnipple and radially disposed burner arms and ears between said arms,said chamber being open at the bottom; screws arranged through said earson said tip member and plate to engage the ears Off said mixing tubemember; a screen arranged in said chamber and removable therefromthrough the opening in the bottom thereof; and a closure plate for saidchamber, said plate and screen being removable without disassembling theburner.

5. In a gas lamp, the combination with the gas supply pipe, of a chimneycomprising a discharge flue and a deflector plate at the lower end ofsaid flue, said plate being provided with a burner opening; a burnercomprising a mixing tube member disposed above said plate provided witha delivery opening registering with the opening of said plate and aburner tip member disposed be low said plate provided with a deliverychamber registering with said opening in said plate and with burner tiparms having burner tips thereon; screws connecting said burner tipmember with the burner member above said plate whereby said burner tipmember is supported; and a burner screen removably arranged in saiddelivery chamber of said burner tip member and adapted to be removed orinserted therein without disassembling the burner members or removingthe burner tips from the burner tip member.

(3. In a gas lamp, the combination with the gas supply pipe, of achimney comprising a flue, a deflector plate at the lower end of saidflue and a skirt below said plate; a burner comprising a mixing tubemember arranged above said plate, and a burner tip member arranged belowsaid plate and communicating with said member above said plate, saidburner tip member being provided with a central delivery screen chamberand having a plurality of burner tip arms grouped about said deliverychamber within said chimney skirt, said arms being provided with burnertips; and a burner screen removably arranged in said delivery chamber,said screen being common to all of the burner passage arms and beingremovable itrom the bottom of the chimney skirt without disassemblingthe burner or removing the tips of the burners.

T. In a gas lamp, a burner provided with a plurality of passage arms anda central delivery chamber open at the bottom between said arms; aclosure plate for the bottom of? said chamber; and lugs on said armsadapted to engage the edges of said plate.

In a gas lamp, the combination of an inverted burner; a chimney thereforcom' prising a pair of delivery flues segmental in cross section; adeflector plate having an upwardly-projecting annular shoulder, saidplate being extended beyond said shoulder to provide a chimney flangeand having por tions struck up therefrom to provide flue openings, saidflues being arranged within said shoulder, the struck up portions beingsecured to their inner sides; and a skirt portion sleeved upon amlsecured to said shoulders of said plate.

9. .In a gas lamp, the combination of an inverted burner; a. chimneytherefor comprising a pair of delivery tlues segmental in cross section;and a deflector plate having an upwardly-projecting annular shoulder,said plate having portions struck up therefrom to provide flue openings,said llues being arranged within said shoulder, the struck up portionsbeing secured to their inner sides.

10. in a gas lamp, the-combination of an inverted burner; a chimneytherefor com prising delivery fines; and a deflector plate having anltpwardly-projecting shoulder, said flues being arranged within andsecured to said shoulder, portions of said plate being struck up andsecured to the inner edges of said lines and coaeting with the shoulderto support the same.

1]. In a gas lamp, the combination of an inverted burner; a chimneytherefor comprising a pair of delivery flues segmental in cross section;a deflector plate having an upwardly-projecting annular shoulder, saidplate being extended beyond said shoulder to provide a chimney flange,said fines be ing arranged within said shoulder; a globe supportingring; a hinge therefor compris ing an angled strap-like hinge membersecured to one of said fines and to said flange; and a catch for saidglobe ring comprising an angled strap-like keeper secured to the otherof said fines and to said flange constituting supporting bracestherefor.

12. In a gas lamp, the combination of an inverted burner; a chimneytherefor comprising a pair of delivery fines; a deflector plate arrangedat the lower ends of said fines; a globe supporting ring; a hingetherefor comprising an angled strap-like hinge member secured to one ofsaid fines and to said plate; and a catch for said globe ring comprisingan angled strap-like keeper secured to the other of said lines and tosaid plate constituting supporting braces therefor.

13. In a gas lamp, the combination with the supply pipe, of a chimney; achimney casing; a main burner; a pilot burner; a supply pipe couplinghaving a lateral delivery arm with a seat in its outer end; a pilot tubemounted on said arm, said arm being provided with a passagecommunicating with said tube and opening in the face of said seat in theend of the arm; a valve casing arranged on the outside of said chimneycasing having a nipple adapted to engage said seat in said coupling arm,said casing being provided with a passage adapted to register with thepilot passage in said arm when said valve casing is mounted thereon; amain burner valve arranged in said valve casing; and a pilot burnervalve arranged in said valve casing and communicating with the saidpilotdelivery passage thereof.

It. In a gas lamp, the combination with a supply pipe, of a chimney; achimney easing into which said pipe depends; an inverted burnercomprising a horizontallydisposed passage member having anupwardly-projecting supply pipe coupling thereon provided with a valvecasing de livery arm projecting therefrom, said chimney being mounted onsaid burner and provided with an outwardly-projecting flange on whichsaid chimney casing is mounted and with a skirt portion below saidflange; a pilot burner comprising a sectional delivery tube, one sectionof which is secured to and supported by said coupling delivery arm, theother being arranged through the skirt of said chimney and connected tothe section carried by said arm; and a valve casing mounted on saidcoupling and provided with main burner and pilot valves, the valvecasing and coupling arm being provided with pilot burner passages communicating when the valve casing is mounted on said arm.

15. In a gas lamp, the combination with a supply pipe, of a main burner;a supply pipe coupling; a pilot burner mounted on said coupling, saidcoupling being provided with a passage communicating with said pilotburner; a valve casing mounted on said coupling, said valve casing beingprovided. with a passage adapted to register with the pilot passage insaid coupling when said valve casing is mounted thereon; a main burnervalve arranged in said valve casing; and a pilot burner valve arrangedin said valve casing and communicating with the said pilot deliverypassage thereof.

16. In a gas lamp, the combination with a gas supply pipe, of a mainburner; a supply pipe coupling; a pilot burner mounted on said supplypipe coupling, said supply pipe coupling being provided with a passagecommunicating with said burner; and a valve casing mounted on saidcoupling and having a passage communicating with said pilot burnerpassage of said coupling and provided with main and pilot valves.

17 An inverted burner comprising a delivery chamber open at its bottomand delivery passage arms opening into the side of the chamber, acylindrical burner screen common to all of said passage arms removablethrough the bottom of said chamber between the said arms, a closure forsaid chamber provided with a flange fitting into the chamber, saidscreen being arranged within said flange and having its lower edgeturned inwardly, a clamping disk engaging the inturned edges of saidscreen, a finger piece for said closure, and screws securing saidclosure clamping plate and finger piece.

18. An inverted burner comprising a delivery chamber open at its. bottomand delivery passage arms opening into the side of the chamber, acylindrical burner screen common to all of said passage arms removablethrough the bottom of said chamber between the said arms, a closure forsaid chamber provided with a flange fitting into the chamber, saidscreen being arranged within said flange and having its lower edgeturned inwardly, and a clamping disk engaging the inturned edges of saidscreen, said clamping disk being secured to said closure.

In witness whereof, we have hereunto set our hands and seals in thepresence of two witnesses.

FREDERICK J. HUMPHREY. HUBERT R. HUMPHREY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

